19 个代码片段让 WordPress 更易于管理

1. 根据用户名来限制管理菜单项目的访问

如果你希望你的管理菜单的某些项对某些用户可见，那么这个代码就会帮到你。只需替换 functions.php 中的 clients-username 为如下代码即可：

function remove_menus()
{
    global $menu;
    global $current_user;
    get_currentuserinfo();

    if($current_user->user_login == 'clients-username')
    {
        $restricted = array(__('Posts'),
                            __('Media'),
                            __('Links'),
                            __('Pages'),
                            __('Comments'),
                            __('Appearance'),
                            __('Plugins'),
                            __('Users'),
                            __('Tools'),
                            __('Settings')
        );
        end ($menu);
        while (prev($menu)){
            $value = explode(' ',$menu[key($menu)][0]);
            if(in_array($value[0] != NULL?$value[0]:"" , $restricted)){unset($menu[key($menu)]);}
        }// end while

    }// end if
}
add_action('admin_menu', 'remove_menus');

2. 从面板中删除默认的Widget部件

// Create the function to use in the action hook
function example_remove_dashboard_widgets() {
    // Globalize the metaboxes array, this holds all the widgets for wp-admin

    global $wp_meta_boxes;

    // Remove the incomming links widget
    unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);   

    // Remove right now
    unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now']);
    unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
    unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
}

// Hoook into the 'wp_dashboard_setup' action to register our function
add_action('wp_dashboard_setup', 'example_remove_dashboard_widgets' );

3. 在 WP Admin 中显示紧急信息

该代码将任何登录的用户显示定制的消息

/**
 * Generic function to show a message to the user using WP's
 * standard CSS classes to make use of the already-defined
 * message colour scheme.
 *
 * @param $message The message you want to tell the user.
 * @param $errormsg If true, the message is an error, so use
 * the red message style. If false, the message is a status
  * message, so use the yellow information message style.
 */
function showMessage($message, $errormsg = false)
{
    if ($errormsg) {
        echo '<div id="message" class="error">';
    }
    else {
        echo '<div id="message" class="updated fade">';
    }

    echo "<p><strong>$message</strong></p></div>";
}

然后，为管理提醒函数增加钩子用来显示定制消息：

/**
 * Just show our message (with possible checking if we only want
 * to show message to certain users.
 */
function showAdminMessages()
{
    // Shows as an error message. You could add a link to the right page if you wanted.
    showMessage("You need to upgrade your database as soon as possible...", true);

    // Only show to admins
    if (user_can('manage_options') {
       showMessage("Hello admins!");
    }
}

/**
  * Call showAdminMessages() when showing other admin
  * messages. The message only gets shown in the admin
  * area, but not on the frontend of your WordPress site.
  */
add_action('admin_notices', 'showAdminMessages');

4. 隐藏 WordPress 更新提醒

add_action('admin_menu','wphidenag');
function wphidenag() {
remove_action( 'admin_notices', 'update_nag', 3 );
}

5. 从文章、页面编辑器中移除 Meta-Boxes

function remove_extra_meta_boxes() {
remove_meta_box( 'postcustom' , 'post' , 'normal' ); // custom fields for posts
remove_meta_box( 'postcustom' , 'page' , 'normal' ); // custom fields for pages
remove_meta_box( 'postexcerpt' , 'post' , 'normal' ); // post excerpts
remove_meta_box( 'postexcerpt' , 'page' , 'normal' ); // page excerpts
remove_meta_box( 'commentsdiv' , 'post' , 'normal' ); // recent comments for posts
remove_meta_box( 'commentsdiv' , 'page' , 'normal' ); // recent comments for pages
remove_meta_box( 'tagsdiv-post_tag' , 'post' , 'side' ); // post tags
remove_meta_box( 'tagsdiv-post_tag' , 'page' , 'side' ); // page tags
remove_meta_box( 'trackbacksdiv' , 'post' , 'normal' ); // post trackbacks
remove_meta_box( 'trackbacksdiv' , 'page' , 'normal' ); // page trackbacks
remove_meta_box( 'commentstatusdiv' , 'post' , 'normal' ); // allow comments for posts
remove_meta_box( 'commentstatusdiv' , 'page' , 'normal' ); // allow comments for pages
remove_meta_box('slugdiv','post','normal'); // post slug
remove_meta_box('slugdiv','page','normal'); // page slug
remove_meta_box('pageparentdiv','page','side'); // Page Parent
}
add_action( 'admin_menu' , 'remove_extra_meta_boxes' );

6. 创建个性化的面板

可轻松编辑自己的应用

// Create the function to output the contents of our Dashboard Widget
function example_dashboard_widget_function() {
    // Display whatever it is you want to show
    echo "Hello World, I'm a great Dashboard Widget";
} 

// Create the function use in the action hook
function example_add_dashboard_widgets() {
    wp_add_dashboard_widget('example_dashboard_widget', 'Example Dashboard Widget', 'example_dashboard_widget_function');
}
// Hoook into the 'wp_dashboard_setup' action to register our other functions
add_action('wp_dashboard_setup', 'example_add_dashboard_widgets' );

7. 禁用插件停用的功能

该代码将移除插件中的 Deactivate 链接，将下面代码保存到 functions.php 并保存。

add_filter( 'plugin_action_links', 'slt_lock_plugins', 10, 4 );
function slt_lock_plugins( $actions, $plugin_file, $plugin_data, $context ) {
    // Remove edit link for all
    if ( array_key_exists( 'edit', $actions ) )
        unset( $actions['edit'] );
    // Remove deactivate link for crucial plugins
    if ( array_key_exists( 'deactivate', $actions ) && in_array( $plugin_file, array(
        'slt-custom-fields/slt-custom-fields.php',
        'slt-file-select/slt-file-select.php',
        'slt-simple-events/slt-simple-events.php',
        'slt-widgets/slt-widgets.php'
    )))
        unset( $actions['deactivate'] );
    return $actions;
}

8. 根据角色添加、删除和记录面板部件

function tidy_dashboard()
{
  global $wp_meta_boxes, $current_user;

  // remove incoming links info for authors or editors
  if(in_array('author', $current_user->roles) || in_array('editor', $current_user->roles))
  {
    unset($wp_meta_boxes['dashboard']['normal ']['core']['dashboard_incoming_links']);
  }

  // remove the plugins info and news feeds for everyone
  unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
  unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
  unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);

}
//add our function to the dashboard setup hook
add_action('wp_dashboard_setup', 'tidy_dashboard');

下面是用来取消默认面板部件的代码列表：

//Right Now - Comments, Posts, Pages at a glance
unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now']);
//Recent Comments
unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments']);
//Incoming Links
unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);
//Plugins - Popular, New and Recently updated WordPress Plugins
unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);

//Wordpress Development Blog Feed
unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
//Other WordPress News Feed
unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
//Quick Press Form
unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press']);
//Recent Drafts List
unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_recent_drafts']);

9. 更简单的登录 URL

将下面代码粘贴到 .htaccess 文件，放在 WordPress rewrite 规则之前

RewriteRule ^login$ http://yoursite.com/wp-login.php [NC,L]

10. Remove Pages Columns

下面代码允许你移除 ‘Pages’ 页中的你不再需要的列

function remove_pages_columns($defaults) {
  unset($defaults['comments']);
  return $defaults;
}
add_filter('manage_pages_columns', 'remove_pages_columns');

11. 禁止修改主题

该代码将面板中的 ‘Appearance’ 菜单项移除

add_action( 'admin_init', 'slt_lock_theme' );
function slt_lock_theme() {
    global $submenu, $userdata;
    get_currentuserinfo();
    if ( $userdata->ID != 1 ) {
        unset( $submenu['themes.php'][5] );
        unset( $submenu['themes.php'][15] );
    }
}

12. 修改面板底部的文本

function remove_footer_admin () {
    echo "Your own text";
} 

add_filter('admin_footer_text', 'remove_footer_admin');

13. Remove Author Metabox/Options & Move to Publish MetaBox

// MOVE THE AUTHOR METABOX INTO THE PUBLISH METABOX
add_action( 'admin_menu', 'remove_author_metabox' );
add_action( 'post_submitbox_misc_actions', 'move_author_to_publish_metabox' );
function remove_author_metabox() {
    remove_meta_box( 'authordiv', 'post', 'normal' );
}
function move_author_to_publish_metabox() {
    global $post_ID;
    $post = get_post( $post_ID );
    echo '<div id="author" class="misc-pub-section" style="border-top-style:solid; border-top-width:1px; border-top-color:#EEEEEE; border-bottom-width:0px;">Author: ';
    post_author_meta_box( $post );
    echo '</div>';
}

14. 修改登录的 Logo

新的 logo 尺寸是 326 x 82 ，把图片放到主题的 images 目录，然后修改下面代码的 ‘companylogo.png’ 并将代码粘贴到 functions.php

// login page logo
function custom_login_logo() {
    echo '<style type="text/css">h1 a { background: url('.get_bloginfo('template_directory').'/companylogo.png) 50% 50% no-repeat !important; }</style>';
}
add_action('login_head', 'custom_login_logo');

15. 移除文章 Columns

该代码将移除 posts 页面的列

function remove_post_columns($defaults) {
  unset($defaults['comments']);
  return $defaults;
}
add_filter('manage_posts_columns', 'remove_post_columns');

16. 禁用管理面板的顶级菜单

function remove_menus () {
global $menu;
    $restricted = array(__('Dashboard'), __('Posts'), __('Media'), __('Links'), __('Pages'), __('Appearance'), __('Tools'), __('Users'), __('Settings'), __('Comments'), __('Plugins'));
    end ($menu);
    while (prev($menu)){
        $value = explode(' ',$menu[key($menu)][0]);
        if(in_array($value[0] != NULL?$value[0]:"" , $restricted)){unset($menu[key($menu)]);}
    }
}
add_action('admin_menu', 'remove_menus');

17. 禁用管理面板的子菜单

function remove_submenus() {
  global $submenu;
    unset($submenu['index.php'][10]); // Removes 'Updates'.
    unset($submenu['themes.php'][5]); // Removes 'Themes'.
    unset($submenu['options-general.php'][15]); // Removes 'Writing'.
    unset($submenu['options-general.php'][25]); // Removes 'Discussion'.
}
add_action('admin_menu', 'remove_submenus');

18. 增加自定义的面板 Logo

首先需要创建透明的图片，尺寸为 30x31px (.gif or .png) 然后保存到主题的 images 目录 (/wp-content/themes/theme-name/images) ，名字任意

//hook the administrative header output
add_action('admin_head', 'my_custom_logo');

function my_custom_logo() {
echo '
<style type="text/css">
#header-logo { background-image: url('.get_bloginfo('template_directory').'/images/custom-logo.gif) !important; }
</style>
';
}

19. 为新的管理条添加和删除链接

function my_admin_bar_link() {
    global $wp_admin_bar;
    if ( !is_super_admin() || !is_admin_bar_showing() )
        return;
    $wp_admin_bar->add_menu( array(
    'id' => 'diww',
    'parent' => 'my-blogs',
    'title' => __( 'Title of the link you want to add'),
    'href' => admin_url( 'http://mysitesurl.com/wp-admin.php' )
    ) );
}
add_action('admin_bar_menu', 'my_admin_bar_link');

function remove_admin_bar_links() {
    global $wp_admin_bar;
    $wp_admin_bar->remove_menu('my-blogs');
    $wp_admin_bar->remove_menu('my-account-with-avatar');
}
add_action( 'wp_before_admin_bar_render', 'remove_admin_bar_links' );